Galaxy S10 screen deep dive: Dynamic AMOLED, HDR10+, explained

Samsung says its new phone screen is the best it's ever made. We parse the tech that makes it possible.

David Katzmaier Editorial Director -- Personal Tech
David reviews TVs and leads the Personal Tech team at CNET, covering mobile, software, computing, streaming and home entertainment. We provide helpful, expert reviews, advice and videos on what gadget or service to buy and how to get the most out of it.
Expertise A 20-year CNET veteran, David has been reviewing TVs since the days of CRT, rear-projection and plasma. Prior to CNET he worked at Sound & Vision magazine and eTown.com. He is known to two people on Twitter as the Cormac McCarthy of consumer electronics. Credentials
  • Although still awaiting his Oscar for Best Picture Reviewer, David does hold certifications from the Imaging Science Foundation and the National Institutes of Standards and Technology on display calibration and evaluation.
David Katzmaier
4 min read
James Martin/CNET

The Samsung Galaxy S10 has an in-screen fingerprint reader, wireless charging of other devices, three cameras and an actual headphone jack. But its biggest feature is something its owners will be staring into every day: the screen. 

Samsung's engineers didn't neglect the new phone's display. All four varieties -- the Galaxy S10, Galaxy S10 Plus, Galaxy S10E and Galaxy S10 5G -- have different-sized versions of "the most beautiful display that the Galaxy family has ever seen," according to Samsung. And in 2019 it busts out more screen tech buzzwords than ever, each more arcane than the last.

Watch this: New Galaxy S10 phones pile on sweet specs

We haven't tested the phone yet or really seen its screen in person to compare, but as a TV reviewer (and longtime Samsung phone owner) I have seen many of those buzzwords before.

Here's a cheat sheet with Samsung's latest such words use on the S10, and what they mean. I've listed them in order from most- to least-important, as determined by my reading of Samsung's display deep-dive.

Dynamic AMOLED: Samsung's previous phones used the marketing term Super AMOLED, and so far it's unclear exactly why they switched to Dynamic -- beyond the fact that it figures into HDR and Dynamic tone mapping (see below), and it sounds cool. AMOLED is a real thing though. It stands for active-matrix organic light-emitting diode, and is one of two screen types used in phones today -- the other is LCD (just about every OLED phone screen is active matrix, so just ignore the "AM"). By most measures of image quality OLED is better than LCD, in part because it can achieve an absolute shade of black, which improves contrast.

Forget "Dynamic" and "AM" then: the OLED nature of the S10's screen will, as always, be the most important contributor to its image quality. Just like with TVs.

Galaxy S10, S10 Plus, S10E: Every camera lens and curve

See all photos

1,200 nits peak luminance: Nits are a measure of light output, and 1,200 of them is hella bright. High-end LCD TVs can exceed that amount, but even OLED TVs can't. I'm betting Samsung achieves that number for short periods in a tiny portion of the screen, but even so, I expect the S10 to be the brightest OLED phone yet -- which should help not only with HDR video, but more importantly in a phone, visibility in bright sunlight. Samsung's newer OLED phone screens have also been very good at dealing with reflections, another major factor in bright-light performance, and I expect the same from the S10.

100 percent mobile color volume in the DCI-P3 color range: This means the phone should have a wide color gamut for more realistic colors. The P3 color gamut is standard for HDR (high dynamic range) and many new TVs come close to covering it -- the closest I've measured is 99 percent on LG's OLED models. 100 percent color volume refers to covering that gamut at every brightness level, something I don't even measure in TVs. In my visual tests differences in color volume have only been visible in the most extreme colors. Paired with a "0.4 Just Noticeable Color Difference (JNCD) score," in DisplayMate's tests, I expect the S10's colors to be extremely accurate and realistic in the best screen mode(s).

Blue-light emission of 7 percent: Excessive blue light from screens can keep you awake -- by signaling the brain to stop producing melatonin -- and may even contribute to blindness according to one report (here's our explainer). Samsung says the screen of the S10 lowers "the percentage of the blue light coming out of smartphone OLED panels from 12 percent to only 7 percent, a threshold never before reached in the marketplace. Moreover, the new OLED display emits 61 percent less blue light than most conventional LCD displays in smartphones today." 

I asked Samsung's representative how can do that and maintain 100 percent DCI-P3 color gamut. The reply? "Previous versions of OLED had a level of color gamut that exceeded the DCI-P3 color specification, while the new OLED with lower blue light emissions fits the DCI-P3 specification 100 percent." Samsung Display also intends to bring its blue-light-reducing tech to other small screens, including a 15.8-inch OLED laptop screen.


The S10's camera will be able to record HDR video.

James Martin/CNET

HDR10+: This is the first phone in the world to support HDR10+, the third-most-popular (at best) high dynamic range format, and one championed primarily by Samsung itself. HDR for displays -- not to be confused with HDR for photography -- improves image quality by boosting highlights to make them look more realistic, widening color and more. Standard HDR10 and another format called Dolby Vision are more widely available, while HDR10+ is currently only available from Amazon Prime video, namely its original series. In my comparisons on TVs it's been tough to differentiate between the three in many cases. Here's how they compare.

Dynamic tone mapping: With HDR for TVs tone mapping refers to changing the incoming video to best match the capabilities of the display. Doing it dynamically, where a video processor automatically analyses and adjusts the image scene by scene, in theory allows improved quality with both HDR and non-HDR material. Samsung's description sounds similar to TVs with this feature, including LG's OLED models. Turning it on can achieve a punchier image while leaving it off keeps the image as the content producer intended. Video purists typically leave it off, but it could potentially be a good thing for some material -- for example by making non-HDR mobile games look more HDRiffic.

On paper and based on Samsung's previous phone displays, the S10 could indeed be the best yet. We're looking forward to seeing that screen in person soon and comparing it to other phones in a full CNET review.